To create the XML database from the raw database stored into the folder @file{data}, use the command @code{MetaDB} as follows:
@cartouche
@example
$java org.metaqtl.main.MetaDB -e data/experiments.csv -m data/genetic-map \
                              -q data/qtl-map -t data/trait_ontology.csv \
			      -d data/marker_dictionary.csv -o xml
@end example
@end cartouche
@noindent
Note that the command is run into the current directoy (not in the directoy @file{data}) and that the ouput XML database is created into the directoy @file{xml} (it will be created by the program).
Now, if we have a look to @file{xml} we can see 19 xml files, 18 summarizing the information of the 18 input mapping experiments and one file @file{ontology.xml} which gives the XML representation of the input trait ontology. 
Then, we will no longer use the file in the folder @file{data}: only the XML files in @file{xml} must be used to carry out further studies with @b{MetaQTL}.

